Questions tagged [port-forwarding]

For questions about port forwarding on an on topic network device. For instance, you have a firewall and need to forward a port to an internal server, but you do not know how.

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950 views

Cannot get port-forward working on ASA 5505: “Drop-reason: (acl-drop) Flow is denied by configured rule”

Months ago I made this post here on NE, but I still for the life of me just cannot figure our port-forwarding on my ASA 5505. I have since started over and am now trying the DMZ port instead, but ...
5
votes
1answer
855 views

Switch FIB and router FIB

Forwarding Information Base (FIB) also called Forwarding Table or Mac Table according to wikipedia. I first explain my understanding of the FIB in both Switch and Router. Does not hesitate to correct ...
3
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2answers
62 views

Why isn't web traffic blocked by router?

(A naive/stupid question which I couldn't find answer to on the web.) Why is the internet traffic reaching me even if I haven't set up port forwarding. (For example, I can view websites). What I ...
3
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1answer
31 views

In port forwarding, is the ultimate destination decided solely by the intermediary entity?

In port forwarding, is the ultimate destination to connect to solely decided by the intermediary entity which provides port forwarding, not by an application client? Although the page mentions dynamic ...
3
votes
2answers
4k views

Cisco ASA Port Forward using a custom RDP Port

I am having trouble setting up RDP access from outside the network using a custom port. I would like for port 5000 to be translated externally to 3389 internally. I have set it up with the commands ...
3
votes
1answer
641 views

ASA 5505 OS 9.0 Port Forwarding

I've been beating my head against this for a while now and I've tried all links I could find that were even the least bit relevant to my situation. Any and all information is greatly appreciated. ...
2
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1answer
1k views

Port-forwarding rule on Cisco ASA not working - “Drop-reason: (acl-drop) Flow is denied by configured rule”

New to Cisco, so I hope this question isn't too noobish. I am trying to setup a port-forwarding rule to allow "any" SSL traffic in from "Outside" to the web server on my LAN. The problem is apparently ...
2
votes
1answer
4k views

How to setup port forwarding on Cisco Router running Version 15.2(4)M6

I'm trying to get traffic forwarded from my network's public IP to a private IP within the network to allow access to a server from outside the LAN. I can't quite figure out how to do it unfortunately....
1
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1answer
153 views

Help understanding “tunneling”

Tunneling = allows a network user to access or provide a network service that the underlying network does not support or provide directly (wikipedia) How does the "network service" not support a ...
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2answers
628 views

Hosting multiple web servers or web applications on a private network

If a web site is hosted on a public network it can directly be accessed using it IP. If it is hosted on a private network it can still be accesses if the NAT device conducts a port forwarding of some ...
1
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1answer
32 views

Port Forwarding on Cisco ASA 5510

I have an EDI server behind a Cisco ASA 5510 version 8.2(1). Currently our EDI server sends over documents to our trading partners and they will look for our URL in this format http://1.1.1.1:1000. ...
1
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1answer
105 views

Reach IP in Parent Network [closed]

We have a router (Router 2) inside a network (Router 1) with a client (Client in Router 2) that needs to make a TCP connection to a client in router 1. We only have access to configure Router 2 and ...
1
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2answers
87 views

Can ISP know whether port forwarding is been done? [closed]

I sit behind a NAT of an institute, which has a rule that implies that no port forwarding can be done. I am developing a peer to peer application, which I need to test. So I have to be sure that it ...
1
vote
1answer
295 views

Cisco Router, Port Forwarding, ACL ordering

I'm new CCNA learner here. If I have the following access list: access-list 101 permit ip 10.10.0.0 0.0.255.255 any access-list 101 deny tcp host 10.10.0.1 eq 443 any access-list 101 deny tcp host ...
1
vote
1answer
423 views

Configuring static NAT on Cisco Router

I am trying to configure port forwarding on a Cisco 891F router given by an ISP and directly connected to servers in the 192.168.170.0/24 network. The ISP recommended using the ip nat inside source ...
1
vote
1answer
99 views

What requirements must general firewall/routing software meet, to make OSI 2 port mirroring work correctly?

The basics are obvious, but there are technical points of networking implication which I don't understand. Some of these are general to networking, others general to all routing/firewall softwares ...
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0answers
16 views

Port forward no destination [closed]

Context: I'm running a home game server and my paranoid network administrator has allowed port forwarding under the sole condition that I airgap the server hardware when I'm not actively using it. Our ...
1
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0answers
37 views

How can I configure a Cisco router 4300 to allow internal server ip:80 to be accessed on public ip:4500

I have an internal web server on port 80. I need help commands maybe to configure port forwarding to access the server on my private network from a public IP Current running config interface ...
1
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0answers
92 views

SSH into device attached to another router [closed]

I saw this questionwhich looks kind of related, but I'm not sure as the answers are too confusing. Basically, I want to SSH into my Raspberry Pi from my laptop. Eventually I want to have the Pi ...
0
votes
1answer
91 views

If you're behind a firewall and all the ports are blocked, how is your browser able to access the internet?

I'm behind a router and I'm able to run game servers on my home computer after forwarding ports or using the DMZ feature on the router. However, I still don't understand the underlying technology as ...
0
votes
2answers
262 views

port forwarding in router [closed]

I have the following configuration: Tp link router : WAN Interface--- 5.6.7.8 LAN Interface---192.168.0.1 Planet router : WAN Interface---192.168.0.10 LAN Interface-...
0
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2answers
39 views

Why doesn't NAT drop packets with spoofed public source IP?

As I read on Section 4.3.8 of this page https://www.manrs.org/isps/guide/antispoofing/, The following code: ip nat inside source list INSIDE pool OUTSIDE overload will translate packets with a ...
0
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2answers
60 views

Why can some people use public ip address to access a server from an internal network with the client device within the internal network

As the title suggests. I find it mind breaking to think how network architecture can differ to allow/not allow using public IP address to access a server within internal network from within the ...
0
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1answer
43 views

Problem Forwarding Port 22 for SSH [closed]

I'm trying to forward port 22 so I can SSH into my PC from a different network but it doesn't seem to be working. I can do ssh mihkel@my_public_ip from the network that the PC is on but it doesn't ...
0
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2answers
386 views

Simplest explanation of ports, sockets, processes [closed]

Can anyone explain the simplest definition of what ports, sockets and processes are and what is the relationship between all 3. Thanks in advance.
0
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1answer
85 views

SSH and port forwardings in both directions [closed]

I can't undersatand this : All communication happens using SSH with port forwardings in both directions Any help? Thanks.
0
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1answer
22 views

Public IP address does not work in internal network [closed]

I have configured port forwarding to my system from the router configuration menu, when I try to access the public IP address in the internal network it does not respond but it is accessible outside ...
0
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1answer
31 views

When port-forwarding, will a port only be listed as OPEN if the service host is actually reachable?

I'm fiddling around in my lab today and attempting to learn more about port-forwarding. I've noticed that when I set up port-forwarding for a given port and run a port scan from outside the network, ...
0
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2answers
748 views

How to connect multiple devices with identical static IP into a wireless network

I've been searching StackExchange and the Internet for a while looking for a solution for my networking question. Some articles I found are here, here and here, but these don't need to deal with a ...
0
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1answer
281 views

RDP on IPV6 using DS-Lite-Tunnel [closed]

I am trying to access one of my PCs from and external network using RDP on port 3389. After realizing my ISP uses DS-Lite-Tunnel I gave up ipv4 and focusing on ipv6. So far the only way I managed ...
0
votes
1answer
832 views

Port Forward for OpenVPN Server behind two routers [closed]

I am stuck how to establish port forwarding between the Internet and an OpenVPN server behind two routers. I need the first router as an Internet DSL modem and VoIP phone access (both services from ...
0
votes
1answer
65 views

Port forwarding using Putty [closed]

I have a server (running ubuntu) where I am running BRAT(http://brat.nlplab.org), which creates a standalone server at http://127.0.0.1:8001. Now I want to access this in my local machine (Windows 10)....
0
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0answers
39 views

How to forward port 80 and 443 on pfSense to a (internal) nginx webserver?

Yesterday we did a "big bang" firewall switch in our company. Our new firewall is a pfSense server. Lets say our external ip is 84.1.1.1, pfSense is 192.168.1.1 and our web server ip is 192.168.1.2. ...
0
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1answer
55 views

Static port forward 1194 to VPN server behind Cisco router

I'm trying to setup a VPN server behind a Cisco router which is my main internet gateway. I've set it up as shown in the attached picture. The problem I'm observing is that zero packets with a ...
0
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0answers
219 views

Simultaneous dynamic and static NAT not working

Cisco 4200 series running IOS XE with a single public IP address and dynamic NAT, which works just fine. I am trying to add Static NAT to access a server (map external port XX to internal port YY. ...